[issue39573] Make PyObject an opaque structure in the limited C API

[Andy Lester]

Andy Lester <andy at petdance.com> added the comment:

@vstinner would it be helpful if I went on a sweep looking for places we can use the new Py_IS_TYPE macro?

Getting away from Py_TYPE(op) would also mean a move to making the internals const-correct.

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nosy: +petdance

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39573>
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